my mail was working fine, then all of a sudden the Routing Group Connection i had between Server A and Server B started queing mail on the connection located on Server A.
I tried to force a connection, but it was in constant retry state.
So i did a telnet to Server B from Server A, initiated a ehlo <domain name> and the following line came back
454 Temporary EXPS-Authentication failure
After doing some research i found the following description on this error, but the solution doesn't seem to fit in with me at all... As all DC's are functioning correctly in our Domain.. i can't find any errors.
"The error message "454 Temporary EXPS-Authentication failure" is emitted by
the exps (exchange protocol-security) sink in Exchange. Usually this means
that the sink is unable to initialize due to DS connectivity/availability
problems. Are you sure you are not receiving a response to EHLO? This
message is returned as a response to the EHLO command by the Exchange
server. If your domain-controller is down, SMTP might seem to hang for a
little while (as it tries to connect to the DS) before it gives up and comes
back with this error.
I would look in the event-log for other errors, but I think this is a DS
connectivity issue. Pull up ldp.exe and make sure you can connect and query
I have another server, say Server C, which is setup exactely the same as Server B, and i can telnet from Server A to C without any issues..
I can use the helo command, but after doing a mail from:firstname.lastname@example.org it kicks me out with the same error from the telnet session.
As it stands, i've had to create a X.400 connection to alow mail to flow, and have freezed the existing RGC.
If someone could help me understand this a little more, that would be appreciated.